20399960

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{41}}^1\times {\mathrm{1777}}^1$

素因数の和:1836

約数の個数: 64

約数和(自身を含む): 53766720

約数和(自身を除く): 33366760

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 41, 56, 70, 82, 140, 164, 205, 280, 287, 328, 410, 574, 820, 1148, 1435, 1640, 1777, 2296, 2870, 3554, 5740, 7108, 8885, 11480, 12439, 14216, 17770, 24878, 35540, 49756, 62195, 71080, 72857, 99512, 124390, 145714, 248780, 291428, 364285, 497560, 509999, 582856, 728570, 1019998, 1457140, 2039996, 2549995, 2914280, 4079992, 5099990, 10199980, 20399960]

約数ペア:

[(1, 20399960), (2, 10199980), (4, 5099990), (5, 4079992), (7, 2914280), (8, 2549995), (10, 2039996), (14, 1457140), (20, 1019998), (28, 728570), (35, 582856), (40, 509999), (41, 497560), (56, 364285), (70, 291428), (82, 248780), (140, 145714), (164, 124390), (205, 99512), (280, 72857), (287, 71080), (328, 62195), (410, 49756), (574, 35540), (820, 24878), (1148, 17770), (1435, 14216), (1640, 12439), (1777, 11480), (2296, 8885), (2870, 7108), (3554, 5740)]